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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8dcd74ae5c1e43c1d8d0bfe90f8be611dafcb768f5403d9f4b2ed6ac0788d5' 
  AND token = 'X7Tr35lNnYlnc83wnb5FdcMPV6cRC64MYXBGsrNNmR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}